//cname:key
//cvalue:value
//exdays:存储的天数
function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
    var expires = "expires=" + d.toGMTString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
}

function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i].trim();
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}

//检测 cookie 值的函数
function checkCookie() {
    var user = getCookie("account");
    if (user != "") {
        //跳转页面
        window.location.href = "http://localhost:8080/index1";
        alert("欢迎 " + user + " 再次访问");
        return false;
    }
    return true;
}